src/scripts/common/login/form-caching.ts


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import { addPostListener, addPostResponder, JQueryAjaxResponse } from "@/shared/intercept-jquery-ajax";

/** Caches the login area HTML to avoid re-fetching it on subsequent requests. */
let loginAreaHTML: string | null = null;

/**
 * Intercepts `viewLoginAreaAction` AJAX requests and serves the cached HTML
 * if available, avoiding an unnecessary network round-trip.
 */
addPostResponder(
	"viewLoginAreaAction",
	function(_args): JQueryAjaxResponse | undefined | null {
		return loginAreaHTML
			? {
				data: loginAreaHTML
			}
			: null;
	}
);

/**
 * Listens for successful `viewLoginAreaAction` responses and stores the
 * returned HTML so the responder above can serve it from cache later.
 */
addPostListener(
	"viewLoginAreaAction",
	function(_args, result): void {
		loginAreaHTML = result.data?.toString() ?? null;
	},
	false
);